【摘要】 根据煤岩固体变形能和瓦斯气体膨胀能,建立了煤岩动力灾害统一能量方程,在数值模拟软件FLAC3D中编写了能量计算模块,并考虑采动应力波动载和流固耦合的条件分析了不同瓦斯初始压力作用下巷道围岩的能量分布状态,解释了深部开采条件下在一些含瓦斯煤层中出现的兼具冲击地压和煤与瓦斯突出2种灾害特征的动力灾害现象。认为瓦斯的不同参与程度导致了不同的动力灾害显现特征,瓦斯参与动力灾害的程度可由瓦斯压力或瓦斯含量来表征;煤体中瓦斯压力存在一个临界范围,当瓦斯含量高于此临界值范围时,动力灾害以煤与瓦斯突出的特征为主,反之则以冲击地压的特征为主;在低瓦斯压力下,瓦斯膨胀能量也具有与煤岩体变形能相当的数量级,对含瓦斯煤层的冲击地压研究不可忽视瓦斯的作用。更多还原

【Abstract】 Based on strain energy of coal or rock mass and expansion energy of methane,presented a unified energy equation for underground dynamic disaster analysis. Stress wave boundary condition added and fluid-stress coupling calculation applied,an numerical simulation model with energy calculation mode programmed in FLAC3D was set up to obtain energy distribution of roadway under different original methane pressures. Some deep dynamic phenomena with integrated characteristics of rock-burst and coal-and-methane burst was explained by the simulation results. The results indicate that different methane participation degrees result in different dynamic behaviors,methane participation degree may be represented by methane pressure or methane content; there is a critical range for methane pressure,when it is higher than the critical range,dynamic disaster takes on coal and methane burst’s characteristic,otherwise it takes on rock-burst’s characteristic; even under low methane pressure,methane expansion energy is equivalent to strain energy of coal or rock mass in order of magnitude,so methane can’t be ignored in researching rock-burst in coal seam with methane.更多还原